# Sudoku Lab: Number Puzzle — Daily Brain Training Game

> Daily Brain Training Game (iPhone/iPad app by Wellington Peres.)

- Source: https://appshunter.io/ios/app/sudoku-lab-number-puzzle/id6764198449 (this page in markdown: same URL + `.md`)
- Developer: [Wellington Peres](https://appshunter.io/developer/1895681533)
- Category: Games, Graphics & Design, Casual, Puzzle
- Price: Free
- Age rating: 4+
- Requires: iOS 15.1 · 33 MB
- Languages: American English
- Released: 2026-04-28
- Data updated: 2026-08-04
- User reviews in markdown: https://appshunter.io/ios/app/sudoku-lab-number-puzzle/id6764198449/reviews.md

## What is Sudoku Lab?

Sudoku Lab is the most polished free Sudoku game for iPhone and iPad. Play offline, master 4 difficulty levels, beat the Daily Challenge, and track your streaks.

THREE GAME MODES
 • Classic — 4 difficulty levels (Easy, Medium, Hard, Expert)
 • Daily Challenge — same puzzle for every player, every day. Build your streak.
 • Zen Mode — practice freely, no lives, no pressure
 • Hardcore — unlock by completing 10 Expert puzzles. One mistake = game over.

BUILT FOR FOCUS
 • Pencil marks (notes) for advanced play
 • Auto-notes shortcut
 • Unlimited undo
 • Hints when you're stuck
 • Conflict highlighting
 • Lives system (3 strikes in Easy/Medium, 2 in Hard/Expert)

TRACK YOUR PROGRESS
 • 34 achievements to unlock
 • Best times per difficulty
 • Daily streak tracker
 • Detailed stats per mode

6 THEMES
 • NIOL (default dark)
 • Light, Ocean, Forest, Sunset, Lavender
 • High Contrast (built for accessibility — color blindness tested)

NO INTERNET REQUIRED
Play anywhere, anytime. No signup. No subscription. Your progress is saved on your device.

ABOUT NIOL
Sudoku Lab is the first title from NIOL studio. Coming soon: Block Lab (block puzzle).

Built with care for puzzle lovers.


## Version history (last 5 releases)

### 1.5.2 — 2026-05-22

NEW: 6 themes (including high-contrast for accessibility). Master daily puzzles, climb hardcore mode, unlock 34 achievements. Free, offline, no signup.

### 1.5.0 — 2026-05-07

Version 1.5.0 — performance and accessibility

  • Reworked auto-save: significantly less battery drain on long sessions
  • New: option to turn off haptic feedback in Settings
  • VoiceOver accessibility on the board and achievements list
  • Layout optimized for iPhones with Dynamic Island and iPad
  • Hardcore mode progress text now properly translated
  • Splash screen more consistent with the NIOL theme
  • General performance and stability improvements

  Thanks for playing Sudoku Lab! Rate the app to help fellow puzzle lovers find it.

### 1.4.0 — 2026-05-05

No release notes.

### 1.3.0 — 2026-05-03

No release notes.

### 1.1.0 — 2026-05-01

No release notes.

## More apps by Wellington Peres

- [Block Lab: Block Puzzle](https://appshunter.io/ios/app/block-lab-block-puzzle/id6767081160)

All apps by Wellington Peres: https://appshunter.io/developer/1895681533

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-04.*